Doing what we do at Konotor, we have friends in the app world — many of whom are product and marketing folks in the companies we engage with. We often discuss metrics they are tracking (or could be tracking) for their apps.
Here are a few key questions you may want to think about in relation to measuring your app's performance.
1. Am I capturing all the key info?
This is the easier question, as there are many resources/guides (See here, here, and here for example) online to help you get start...